Response properties of neurons in the IC1-a
| Location | Experience | Lesion1-b | np1-c | ns1-d | Response latency1-e (msec) | Frequency tuning width1-f (kHz) | Best frequency progression1-g (kHz/mm) | Best ILD progression1-h (dB/mm) |
|---|---|---|---|---|---|---|---|---|
| ICX | Normal | Yes | 4 | 8 | 7.8 ± 1.2 | 2.5 ± 0.6 | 0.3 ± 1.8 | −12.3 ± 9.7 |
| No | 8 | 19 | 7.8 ± 1.8 | 2.9 ± 0.7 | 1.3 ± 2.7 | −20.3 ± 9.1 | ||
| Device-reared | Yes | 16 | 25 | 8.9 ± 2.8 | 2.8 ± 0.9 | 3.3 ± 2.8 | −10.0 ± 20.3 | |
| No | 22 | 43 | 8.7 ± 4.3 | 3.2 ± 0.6 | 6.4 ± 4.2 | −16.7 ± 19.3 | ||
| Combined data: | 50 | 95 | 8.5 ± 3.5 | 3.0 ± 0.8 | 3.2 ± 3.8 | −16.3 ± 16.4 | ||
| ICCIs | Normal | Yes | 5 | 12 | 5.8 ± 1.4 | 1.4 ± 0.3 | 5.9 ± 3.2 | 6.7 ± 22.0 |
| No | 29 | 145 | 6.1 ± 1.3 | 1.5 ± 0.6 | 4.4 ± 3.1 | 4.9 ± 36.9 | ||
| Device-reared | Yes | 12 | 15 | 5.6 ± 1.3 | 1.4 ± 0.3 | 3.7 ± 1.5 | −3.2 ± 19.9 | |
| No | 116 | 386 | 5.7 ± 1.2 | 1.3 ± 0.4 | 4.3 ± 2.9 | 2.5 ± 26.2 | ||
| Combined data: | 162 | 558 | 5.8 ± 1.2* | 1.4 ± 0.5* | 4.3 ± 2.9 | 2.8 ± 28.0* | ||
↵F1-a Values are mean ± SD.
↵F1-b Whether or not the sites' locations were verified using reconstruction of electrolytic lesions.
↵F1-c Number of penetrations.
↵F1-d Number of sites.
↵F1-e Measured using a broadband (3–12 kHz) stimulus.
↵F1-f Includes combined widths when curves had multiple peaks (see Fig. 9).
↵F1-g The difference between best frequencies at adjacent sites along a dorsoventral electrode penetration divided by the distance between them. Progression of best frequency with depth was not significant in the ICX of normal owls (one-sample t test, p = 0.16) but was significant in the ICX of device-reared owls and in the ICCIs of both normal and device-reared owls (p < 0.001).
↵F1-h The difference between best ILDs at adjacent sites along a dorsoventral electrode penetration divided by the distance between them.
*ICCIs and ICX totals differed significantly (unpaired t test, p < 0.01).